Electro-mechanical gong



(No Model.)

J. P. TIRRELL.

ELECTED MECHANICAL GONG.

No. 389,423. Patented Sept. 11, 1888 WITNESSES INVENTOB 4? W- F/WM %m f%z// NITE TATES 'ATEN'r rrrcE.

JACOB P. TIRRELL, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE ELEG TRIO GAS LIGHTING COMPANY, OF PORTLAND, MAINE.

ELECTRO MECHANlCAL GONG.

SPECIFICATION forming part of Letters Patent No. 389,423, dated September 11, 1888.

Application filed November 7, 1887. Serial No. 254.462. (No model.)

To all whom it may concern.-

Be it known that I, JACOB I. TiRRELnof Boston, in the State of Massachusetts, have invented an Improvement in Electro-Mechanical Gongs, of which the following is a specification.

The invention consists both in the selection, shaping, and arrangement of the elements en tering into the apparatus and in a novel lever IO combination forsuch apparatus, thus eliminating surplus mechanism and securing a more simple and eflective machine as a whole.

In general construction the appearance of a gong such as I have invented differs but 1:5 slightly from ordinary electric gongs. The mechanism is contained in a clock-shaped box with an open or closed face, and the bell attached below the box covers the hammer projecting therefrom. The mechanism is held by an iron frame attached to the under surface of the box, as shown in Figures. 1 and 2.

Reference to the drawings will now be made, in which similar letters denote similar parts.

Fig. 1 is a View of my invention as it appears when at rest upon the frame-work, the hammer being held by the latch. Fig. 2 is a side view of the mechanism of Fig. 1. Fig. 8 is a front view of a part of the apparatus, showing the position of the star-throw, lever, and

hammer when the gong is about to strike.

In general my invention includes a coiled clock-spring, A,of strength proportional to the size of the gong or hammer G, properly arranged with a clock or winding mechanism,by

which the springA can be restored to position. A large cog driving wheel or main wheel, B, upon which the clock-spring A bears and to which it communicates motion when permitted to act, as hereinafter explained, fits into a small cog or pinion, O, turning upon the axis 1, supported by bearings in the iron frame. Adjacent to this pinion O, upon the same axis, 1 is a star-shaped throw wheel or lever, I), having five or more points, each point being 15 curved slightly upon its bearing-surface. A

dog or clamp,F,controls the motion of this starthrow, being normally, as shown in Fig. 1,held against a pin on movable plate E by means of the hammer G, pivoted at I I to the lower and upper part of said frame, as is the lever H. Hammer G is normally held by an ordinary latch, I, thereby causing the lower arm of the dog F to bear against said pin 1, while stoppin 2 holds the star-throw in place, as shown in Fig. 1. Pins 1 and2 arefixed in a movable lever, E, pivoted at 3. The latch I is pivoted at 4 on the lever L,which lever is pivoted at5 0n the top of a post in the framework. The latch-lever L has two pins or detents, 6 7, by which a corresponding pin, 8,0n the extension K of the armature M holds the'latch-lever in place until the armature is withdrawn by attraction of the magnet N. This magnet N is located by the side of the supporting framework in the box, and the extension or lip K of its armature M is connected with the lever L by means of the pins or detents 6 7 8. The wires 0 1) lead to the battery Q, and the cur rent is admitted by a push-button, R, in the usual form. 0

Having thus described the nature and arrangement of my said invention, I will now explain the operation thereof. Pressure upon push-buttonR admits the current to magnet N. The magnet, being energized, attracts the armature M, carrying the lip K, and thus moving pin 8 away from pin 7,and brings pin 6 in contact with pin 8, until the release of the armature, by breaking the cireuit, allows these pins to separate, when the hammer G falls away by gravity. The hammer falling away brings the upper arm of the dog Fagainst the pin 1 and carries it and E downward,while pin 2 thereby releases the star-throw D, which at once bears against a pin, 1 on the lever H, as shown in Fig. 3, whereby the force of the spring A, acting upon the main wheel B, is communicated to the pinion O, turning the axis or spindle, and thereby causing the starthrow D to revolve with great energy. In its revolution it presses the pin I on the under side of the lever H with considerable force, causing H to move and thereby throw hammer G-,which is also pivoted at I I, with great force against the gong. Vhen the star-point slides 5 off the pin I this movement of the hammerG has moved lever E and pin 2 to their normal position, where it catches the star-throw and holds it, as before. The hammer strikes a single blow upon the bell or gong, and is at too the same time brought into a position to be retained by the latch I until the armature be again attracted and the hammer released, when the operation is repeated as before. It will be noticed that lever L is returned to its normal position by coil-spring S.

The bellor gong is not shown in the drawings, but is to be so placed as to receive the blow of the hammer. A proper arrangement is to support the gong upon apost fixedin the wooden frame below the case containing the mechanism from which the hammer projects.

Having thus explained my invention and its operation, what I claim is- 1. In an electromechanical gong, the combination of the star-throw D with lever H, provided with pin 1 hammer Gr, dog F, standard I I, and plate E, movably pivoted at3 and having pins 1 and 2, substantially as and for the purpose set forth.

JACOB P. TIRRELL.

WVitnesses:

GEORGE W. HANSON, NATHANIEL U. WALKER. 

